Android MediaPlayer OnCompletion NullPointerException

Question

This is my first question. It is giving NullPointerException in media.release() line. Exact output is NullPointerException (@ProgressDetailRecyclerViewAdapter$5:onCompletion:308) {main}

 public void play(String fileURL) {

    try {
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mediaPlayer.setDataSource(fileURL);
        mediaPlayer.prepare();
        mediaPlayer.start();
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mediaPlayer.release(); //line 308
                mediaPlayer = null;
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

Try this

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mp.release(); //line 308
                mp= null;
            }
        });

Answer 2

The variable that gets passed to your onCompletion method is named mp , not mediaPlayer . It's possible your mediaPlayer variable has been nulled since it was initialized, causing the error. Change the code to:

@Override
public void onCompletion(MediaPlayer mp) {
    mp.release(); //line 308
    mp = null;
}

Answer 3

 @Override
            public void onCompletion(MediaPlayer **mp**) {
                **mediaPlayer**.release(); //line 308
                mediaPlayer = null;
            }

use the right object mp instead of mediaPlayer inside this method